firmware: arm_scmi: Use {get,put}_unaligned_le{32,64} accessors

Instead of type-casting the {tx,rx}.buf all over the place while
accessing them to read/write __le{32,64} from/to the firmware, let's
use the existing {get,put}_unaligned_le{32,64} accessors to hide all
the type cast ugliness.
Suggested-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

drivers/firmware/arm_scmi/base.c

@@ -204,7 +204,7 @@ static int scmi_base_discover_agent_get(const struct scmi_handle *handle,
 	if (ret)
 		return ret;
 
-	*(__le32 *)t->tx.buf = cpu_to_le32(id);
+	put_unaligned_le32(id, t->tx.buf);
 
 	ret = scmi_do_xfer(handle, t);
 	if (!ret)

drivers/firmware/arm_scmi/clock.c

@@ -107,7 +107,7 @@ static int scmi_clock_attributes_get(const struct scmi_handle *handle,
 	if (ret)
 		return ret;
 
-	*(__le32 *)t->tx.buf = cpu_to_le32(clk_id);
+	put_unaligned_le32(clk_id, t->tx.buf);
 	attr = t->rx.buf;
 
 	ret = scmi_do_xfer(handle, t);
@@ -204,15 +204,11 @@ scmi_clock_rate_get(const struct scmi_handle *handle, u32 clk_id, u64 *value)
 	if (ret)
 		return ret;
 
-	*(__le32 *)t->tx.buf = cpu_to_le32(clk_id);
+	put_unaligned_le32(clk_id, t->tx.buf);
 
 	ret = scmi_do_xfer(handle, t);
-	if (!ret) {
-		__le32 *pval = t->rx.buf;
-
-		*value = le32_to_cpu(*pval);
-		*value |= (u64)le32_to_cpu(*(pval + 1)) << 32;
-	}
+	if (!ret)
+		*value = get_unaligned_le64(t->rx.buf);
 
 	scmi_xfer_put(handle, t);
 	return ret;

drivers/firmware/arm_scmi/common.h

@@ -15,6 +15,8 @@
 #include <linux/scmi_protocol.h>
 #include <linux/types.h>
 
+#include <asm/unaligned.h>
+
 #define PROTOCOL_REV_MINOR_MASK	GENMASK(15, 0)
 #define PROTOCOL_REV_MAJOR_MASK	GENMASK(31, 16)
 #define PROTOCOL_REV_MAJOR(x)	(u16)(FIELD_GET(PROTOCOL_REV_MAJOR_MASK, (x)))

drivers/firmware/arm_scmi/perf.c

@@ -151,7 +151,7 @@ scmi_perf_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
 	if (ret)
 		return ret;
 
-	*(__le32 *)t->tx.buf = cpu_to_le32(domain);
+	put_unaligned_le32(domain, t->tx.buf);
 	attr = t->rx.buf;
 
 	ret = scmi_do_xfer(handle, t);
@@ -284,7 +284,7 @@ static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
 	if (ret)
 		return ret;
 
-	*(__le32 *)t->tx.buf = cpu_to_le32(domain);
+	put_unaligned_le32(domain, t->tx.buf);
 
 	ret = scmi_do_xfer(handle, t);
 	if (!ret) {
@@ -333,11 +333,11 @@ static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
 		return ret;
 
 	t->hdr.poll_completion = poll;
-	*(__le32 *)t->tx.buf = cpu_to_le32(domain);
+	put_unaligned_le32(domain, t->tx.buf);
 
 	ret = scmi_do_xfer(handle, t);
 	if (!ret)
-		*level = le32_to_cpu(*(__le32 *)t->rx.buf);
+		*level = get_unaligned_le32(t->rx.buf);
 
 	scmi_xfer_put(handle, t);
 	return ret;

drivers/firmware/arm_scmi/power.c

@@ -96,7 +96,7 @@ scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
 	if (ret)
 		return ret;
 
-	*(__le32 *)t->tx.buf = cpu_to_le32(domain);
+	put_unaligned_le32(domain, t->tx.buf);
 	attr = t->rx.buf;
 
 	ret = scmi_do_xfer(handle, t);
@@ -147,11 +147,11 @@ scmi_power_state_get(const struct scmi_handle *handle, u32 domain, u32 *state)
 	if (ret)
 		return ret;
 
-	*(__le32 *)t->tx.buf = cpu_to_le32(domain);
+	put_unaligned_le32(domain, t->tx.buf);
 
 	ret = scmi_do_xfer(handle, t);
 	if (!ret)
-		*state = le32_to_cpu(*(__le32 *)t->rx.buf);
+		*state = get_unaligned_le32(t->rx.buf);
 
 	scmi_xfer_put(handle, t);
 	return ret;

drivers/firmware/arm_scmi/sensors.c

@@ -120,7 +120,7 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
 
 	do {
 		/* Set the number of sensors to be skipped/already read */
-		*(__le32 *)t->tx.buf = cpu_to_le32(desc_index);
+		put_unaligned_le32(desc_index, t->tx.buf);
 
 		ret = scmi_do_xfer(handle, t);
 		if (ret)
@@ -217,7 +217,6 @@ static int scmi_sensor_reading_get(const struct scmi_handle *handle,
 				   u32 sensor_id, u64 *value)
 {
 	int ret;
-	__le32 *pval;
 	struct scmi_xfer *t;
 	struct scmi_msg_sensor_reading_get *sensor;
 	struct sensors_info *si = handle->sensor_priv;
@@ -229,24 +228,20 @@ static int scmi_sensor_reading_get(const struct scmi_handle *handle,
 	if (ret)
 		return ret;
 
-	pval = t->rx.buf;
 	sensor = t->tx.buf;
 	sensor->id = cpu_to_le32(sensor_id);
 
 	if (s->async) {
 		sensor->flags = cpu_to_le32(SENSOR_READ_ASYNC);
 		ret = scmi_do_xfer_with_response(handle, t);
-		if (!ret) {
-			*value = le32_to_cpu(*(pval + 1));
-			*value |= (u64)le32_to_cpu(*(pval + 2)) << 32;
-		}
+		if (!ret)
+			*value = get_unaligned_le64((void *)
+						    ((__le32 *)t->rx.buf + 1));
 	} else {
 		sensor->flags = cpu_to_le32(0);
 		ret = scmi_do_xfer(handle, t);
-		if (!ret) {
-			*value = le32_to_cpu(*pval);
-			*value |= (u64)le32_to_cpu(*(pval + 1)) << 32;
-		}
+		if (!ret)
+			*value = get_unaligned_le64(t->rx.buf);
 	}
 
 	scmi_xfer_put(handle, t);